1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <inttypes.h>
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "avformat.h"
32 #include "avi.h"
33 #include "dv.h"
34 #include "internal.h"
35 #include "isom.h"
36 #include "riff.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavcodec/internal.h"
40
41 typedef struct AVIStream {
42 int64_t frame_offset; /* current frame (video) or byte (audio) counter
43 * (used to compute the pts) */
44 int remaining;
45 int packet_size;
46
47 uint32_t handler;
48 uint32_t scale;
49 uint32_t rate;
50 int sample_size; /* size of one sample (or packet)
51 * (in the rate/scale sense) in bytes */
52
53 int64_t cum_len; /* temporary storage (used during seek) */
54 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
55 int prefix_count;
56 uint32_t pal[256];
57 int has_pal;
58 int dshow_block_align; /* block align variable used to emulate bugs in
59 * the MS dshow demuxer */
60
61 AVFormatContext *sub_ctx;
62 AVPacket sub_pkt;
63 AVBufferRef *sub_buffer;
64
65 int64_t seek_pos;
66 } AVIStream;
67
68 typedef struct AVIContext {
69 const AVClass *class;
70 int64_t riff_end;
71 int64_t movi_end;
72 int64_t fsize;
73 int64_t io_fsize;
74 int64_t movi_list;
75 int64_t last_pkt_pos;
76 int index_loaded;
77 int is_odml;
78 int non_interleaved;
79 int stream_index;
80 DVDemuxContext *dv_demux;
81 int odml_depth;
82 int use_odml;
83 #define MAX_ODML_DEPTH 1000
84 int64_t dts_max;
85 } AVIContext;
86
87
88 static const AVOption options[] = {
89 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
90 { NULL },
91 };
92
93 static const AVClass demuxer_class = {
94 .class_name = "avi",
95 .item_name = av_default_item_name,
96 .option = options,
97 .version = LIBAVUTIL_VERSION_INT,
98 .category = AV_CLASS_CATEGORY_DEMUXER,
99 };
100
101
102 static const char avi_headers[][8] = {
103 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
104 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
105 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
106 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
107 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
108 { 0 }
109 };
110
111 static const AVMetadataConv avi_metadata_conv[] = {
112 { "strn", "title" },
113 { 0 },
114 };
115
116 static int avi_load_index(AVFormatContext *s);
117 static int guess_ni_flag(AVFormatContext *s);
118
119 #define print_tag(s, str, tag, size) \
120 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
121 avio_tell(pb), str, av_fourcc2str(tag), size) \
122
get_duration(AVIStream * ast,int len)123 static inline int get_duration(AVIStream *ast, int len)
124 {
125 if (ast->sample_size)
126 return len;
127 else if (ast->dshow_block_align)
128 return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
129 else
130 return 1;
131 }
132
get_riff(AVFormatContext * s,AVIOContext * pb)133 static int get_riff(AVFormatContext *s, AVIOContext *pb)
134 {
135 AVIContext *avi = s->priv_data;
136 char header[8] = {0};
137 int i;
138
139 /* check RIFF header */
140 avio_read(pb, header, 4);
141 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
142 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
143 avio_read(pb, header + 4, 4);
144
145 for (i = 0; avi_headers[i][0]; i++)
146 if (!memcmp(header, avi_headers[i], 8))
147 break;
148 if (!avi_headers[i][0])
149 return AVERROR_INVALIDDATA;
150
151 if (header[7] == 0x19)
152 av_log(s, AV_LOG_INFO,
153 "This file has been generated by a totally broken muxer.\n");
154
155 return 0;
156 }
157
read_odml_index(AVFormatContext * s,int frame_num)158 static int read_odml_index(AVFormatContext *s, int frame_num)
159 {
160 AVIContext *avi = s->priv_data;
161 AVIOContext *pb = s->pb;
162 int longs_per_entry = avio_rl16(pb);
163 int index_sub_type = avio_r8(pb);
164 int index_type = avio_r8(pb);
165 int entries_in_use = avio_rl32(pb);
166 int chunk_id = avio_rl32(pb);
167 int64_t base = avio_rl64(pb);
168 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
169 ((chunk_id >> 8 & 0xFF) - '0');
170 AVStream *st;
171 AVIStream *ast;
172 int i;
173 int64_t last_pos = -1;
174 int64_t filesize = avi->fsize;
175
176 av_log(s, AV_LOG_TRACE,
177 "longs_per_entry:%d index_type:%d entries_in_use:%d "
178 "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
179 longs_per_entry,
180 index_type,
181 entries_in_use,
182 chunk_id,
183 base,
184 frame_num);
185
186 if (stream_id >= s->nb_streams || stream_id < 0)
187 return AVERROR_INVALIDDATA;
188 st = s->streams[stream_id];
189 ast = st->priv_data;
190
191 if (index_sub_type)
192 return AVERROR_INVALIDDATA;
193
194 avio_rl32(pb);
195
196 if (index_type && longs_per_entry != 2)
197 return AVERROR_INVALIDDATA;
198 if (index_type > 1)
199 return AVERROR_INVALIDDATA;
200
201 if (filesize > 0 && base >= filesize) {
202 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
203 if (base >> 32 == (base & 0xFFFFFFFF) &&
204 (base & 0xFFFFFFFF) < filesize &&
205 filesize <= 0xFFFFFFFF)
206 base &= 0xFFFFFFFF;
207 else
208 return AVERROR_INVALIDDATA;
209 }
210
211 for (i = 0; i < entries_in_use; i++) {
212 if (index_type) {
213 int64_t pos = avio_rl32(pb) + base - 8;
214 int len = avio_rl32(pb);
215 int key = len >= 0;
216 len &= 0x7FFFFFFF;
217
218 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
219
220 if (avio_feof(pb))
221 return AVERROR_INVALIDDATA;
222
223 if (last_pos == pos || pos == base - 8)
224 avi->non_interleaved = 1;
225 if (last_pos != pos && len)
226 av_add_index_entry(st, pos, ast->cum_len, len, 0,
227 key ? AVINDEX_KEYFRAME : 0);
228
229 ast->cum_len += get_duration(ast, len);
230 last_pos = pos;
231 } else {
232 int64_t offset, pos;
233 int duration;
234 offset = avio_rl64(pb);
235 avio_rl32(pb); /* size */
236 duration = avio_rl32(pb);
237
238 if (avio_feof(pb))
239 return AVERROR_INVALIDDATA;
240
241 pos = avio_tell(pb);
242
243 if (avi->odml_depth > MAX_ODML_DEPTH) {
244 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
245 return AVERROR_INVALIDDATA;
246 }
247
248 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
249 return -1;
250 avi->odml_depth++;
251 read_odml_index(s, frame_num);
252 avi->odml_depth--;
253 frame_num += duration;
254
255 if (avio_seek(pb, pos, SEEK_SET) < 0) {
256 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
257 return -1;
258 }
259
260 }
261 }
262 avi->index_loaded = 2;
263 return 0;
264 }
265
clean_index(AVFormatContext * s)266 static void clean_index(AVFormatContext *s)
267 {
268 int i;
269 int64_t j;
270
271 for (i = 0; i < s->nb_streams; i++) {
272 AVStream *st = s->streams[i];
273 AVIStream *ast = st->priv_data;
274 int n = st->nb_index_entries;
275 int max = ast->sample_size;
276 int64_t pos, size, ts;
277
278 if (n != 1 || ast->sample_size == 0)
279 continue;
280
281 while (max < 1024)
282 max += max;
283
284 pos = st->index_entries[0].pos;
285 size = st->index_entries[0].size;
286 ts = st->index_entries[0].timestamp;
287
288 for (j = 0; j < size; j += max)
289 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
290 AVINDEX_KEYFRAME);
291 }
292 }
293
avi_read_tag(AVFormatContext * s,AVStream * st,uint32_t tag,uint32_t size)294 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
295 uint32_t size)
296 {
297 AVIOContext *pb = s->pb;
298 char key[5] = { 0 };
299 char *value;
300
301 size += (size & 1);
302
303 if (size == UINT_MAX)
304 return AVERROR(EINVAL);
305 value = av_malloc(size + 1);
306 if (!value)
307 return AVERROR(ENOMEM);
308 if (avio_read(pb, value, size) != size) {
309 av_freep(&value);
310 return AVERROR_INVALIDDATA;
311 }
312 value[size] = 0;
313
314 AV_WL32(key, tag);
315
316 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
317 AV_DICT_DONT_STRDUP_VAL);
318 }
319
320 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
321 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
322
avi_metadata_creation_time(AVDictionary ** metadata,char * date)323 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
324 {
325 char month[4], time[9], buffer[64];
326 int i, day, year;
327 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
328 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
329 month, &day, time, &year) == 4) {
330 for (i = 0; i < 12; i++)
331 if (!av_strcasecmp(month, months[i])) {
332 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
333 year, i + 1, day, time);
334 av_dict_set(metadata, "creation_time", buffer, 0);
335 }
336 } else if (date[4] == '/' && date[7] == '/') {
337 date[4] = date[7] = '-';
338 av_dict_set(metadata, "creation_time", date, 0);
339 }
340 }
341
avi_read_nikon(AVFormatContext * s,uint64_t end)342 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
343 {
344 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
345 uint32_t tag = avio_rl32(s->pb);
346 uint32_t size = avio_rl32(s->pb);
347 switch (tag) {
348 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
349 {
350 uint64_t tag_end = avio_tell(s->pb) + size;
351 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
352 uint16_t tag = avio_rl16(s->pb);
353 uint16_t size = avio_rl16(s->pb);
354 const char *name = NULL;
355 char buffer[64] = { 0 };
356 size = FFMIN(size, tag_end - avio_tell(s->pb));
357 size -= avio_read(s->pb, buffer,
358 FFMIN(size, sizeof(buffer) - 1));
359 switch (tag) {
360 case 0x03:
361 name = "maker";
362 break;
363 case 0x04:
364 name = "model";
365 break;
366 case 0x13:
367 name = "creation_time";
368 if (buffer[4] == ':' && buffer[7] == ':')
369 buffer[4] = buffer[7] = '-';
370 break;
371 }
372 if (name)
373 av_dict_set(&s->metadata, name, buffer, 0);
374 avio_skip(s->pb, size);
375 }
376 break;
377 }
378 default:
379 avio_skip(s->pb, size);
380 break;
381 }
382 }
383 }
384
avi_extract_stream_metadata(AVFormatContext * s,AVStream * st)385 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
386 {
387 GetByteContext gb;
388 uint8_t *data = st->codecpar->extradata;
389 int data_size = st->codecpar->extradata_size;
390 int tag, offset;
391
392 if (!data || data_size < 8) {
393 return AVERROR_INVALIDDATA;
394 }
395
396 bytestream2_init(&gb, data, data_size);
397
398 tag = bytestream2_get_le32(&gb);
399
400 switch (tag) {
401 case MKTAG('A', 'V', 'I', 'F'):
402 // skip 4 byte padding
403 bytestream2_skip(&gb, 4);
404 offset = bytestream2_tell(&gb);
405
406 // decode EXIF tags from IFD, AVI is always little-endian
407 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
408 1, 0, &st->metadata);
409 break;
410 case MKTAG('C', 'A', 'S', 'I'):
411 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
412 break;
413 case MKTAG('Z', 'o', 'r', 'a'):
414 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
415 break;
416 default:
417 break;
418 }
419
420 return 0;
421 }
422
calculate_bitrate(AVFormatContext * s)423 static int calculate_bitrate(AVFormatContext *s)
424 {
425 AVIContext *avi = s->priv_data;
426 int i, j;
427 int64_t lensum = 0;
428 int64_t maxpos = 0;
429
430 for (i = 0; i<s->nb_streams; i++) {
431 int64_t len = 0;
432 AVStream *st = s->streams[i];
433
434 if (!st->nb_index_entries)
435 continue;
436
437 for (j = 0; j < st->nb_index_entries; j++)
438 len += st->index_entries[j].size;
439 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
440 lensum += len;
441 }
442 if (maxpos < av_rescale(avi->io_fsize, 9, 10)) // index does not cover the whole file
443 return 0;
444 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
445 return 0;
446
447 for (i = 0; i<s->nb_streams; i++) {
448 int64_t len = 0;
449 AVStream *st = s->streams[i];
450 int64_t duration;
451 int64_t bitrate;
452
453 for (j = 0; j < st->nb_index_entries; j++)
454 len += st->index_entries[j].size;
455
456 if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
457 continue;
458 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
459 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
460 if (bitrate > 0) {
461 st->codecpar->bit_rate = bitrate;
462 }
463 }
464 return 1;
465 }
466
avi_read_header(AVFormatContext * s)467 static int avi_read_header(AVFormatContext *s)
468 {
469 AVIContext *avi = s->priv_data;
470 AVIOContext *pb = s->pb;
471 unsigned int tag, tag1, handler;
472 int codec_type, stream_index, frame_period;
473 unsigned int size;
474 int i;
475 AVStream *st;
476 AVIStream *ast = NULL;
477 int avih_width = 0, avih_height = 0;
478 int amv_file_format = 0;
479 uint64_t list_end = 0;
480 int64_t pos;
481 int ret;
482 AVDictionaryEntry *dict_entry;
483
484 avi->stream_index = -1;
485
486 ret = get_riff(s, pb);
487 if (ret < 0)
488 return ret;
489
490 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
491
492 avi->io_fsize = avi->fsize = avio_size(pb);
493 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
494 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
495
496 /* first list tag */
497 stream_index = -1;
498 codec_type = -1;
499 frame_period = 0;
500 for (;;) {
501 if (avio_feof(pb))
502 goto fail;
503 tag = avio_rl32(pb);
504 size = avio_rl32(pb);
505
506 print_tag(s, "tag", tag, size);
507
508 switch (tag) {
509 case MKTAG('L', 'I', 'S', 'T'):
510 list_end = avio_tell(pb) + size;
511 /* Ignored, except at start of video packets. */
512 tag1 = avio_rl32(pb);
513
514 print_tag(s, "list", tag1, 0);
515
516 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
517 avi->movi_list = avio_tell(pb) - 4;
518 if (size)
519 avi->movi_end = avi->movi_list + size + (size & 1);
520 else
521 avi->movi_end = avi->fsize;
522 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
523 goto end_of_header;
524 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
525 ff_read_riff_info(s, size - 4);
526 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
527 avi_read_nikon(s, list_end);
528
529 break;
530 case MKTAG('I', 'D', 'I', 'T'):
531 {
532 unsigned char date[64] = { 0 };
533 size += (size & 1);
534 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
535 avio_skip(pb, size);
536 avi_metadata_creation_time(&s->metadata, date);
537 break;
538 }
539 case MKTAG('d', 'm', 'l', 'h'):
540 avi->is_odml = 1;
541 avio_skip(pb, size + (size & 1));
542 break;
543 case MKTAG('a', 'm', 'v', 'h'):
544 amv_file_format = 1;
545 case MKTAG('a', 'v', 'i', 'h'):
546 /* AVI header */
547 /* using frame_period is bad idea */
548 frame_period = avio_rl32(pb);
549 avio_rl32(pb); /* max. bytes per second */
550 avio_rl32(pb);
551 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
552
553 avio_skip(pb, 2 * 4);
554 avio_rl32(pb);
555 avio_rl32(pb);
556 avih_width = avio_rl32(pb);
557 avih_height = avio_rl32(pb);
558
559 avio_skip(pb, size - 10 * 4);
560 break;
561 case MKTAG('s', 't', 'r', 'h'):
562 /* stream header */
563
564 tag1 = avio_rl32(pb);
565 handler = avio_rl32(pb); /* codec tag */
566
567 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
568 avio_skip(pb, size - 8);
569 break;
570 } else {
571 stream_index++;
572 st = avformat_new_stream(s, NULL);
573 if (!st)
574 goto fail;
575
576 st->id = stream_index;
577 ast = av_mallocz(sizeof(AVIStream));
578 if (!ast)
579 goto fail;
580 st->priv_data = ast;
581 }
582 if (amv_file_format)
583 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
584 : MKTAG('v', 'i', 'd', 's');
585
586 print_tag(s, "strh", tag1, -1);
587
588 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
589 tag1 == MKTAG('i', 'v', 'a', 's')) {
590 int64_t dv_dur;
591
592 /* After some consideration -- I don't think we
593 * have to support anything but DV in type1 AVIs. */
594 if (s->nb_streams != 1)
595 goto fail;
596
597 if (handler != MKTAG('d', 'v', 's', 'd') &&
598 handler != MKTAG('d', 'v', 'h', 'd') &&
599 handler != MKTAG('d', 'v', 's', 'l'))
600 goto fail;
601
602 if (!CONFIG_DV_DEMUXER)
603 return AVERROR_DEMUXER_NOT_FOUND;
604
605 ast = s->streams[0]->priv_data;
606 st->priv_data = NULL;
607 ff_free_stream(s, st);
608
609 avi->dv_demux = avpriv_dv_init_demux(s);
610 if (!avi->dv_demux) {
611 av_free(ast);
612 return AVERROR(ENOMEM);
613 }
614
615 s->streams[0]->priv_data = ast;
616 avio_skip(pb, 3 * 4);
617 ast->scale = avio_rl32(pb);
618 ast->rate = avio_rl32(pb);
619 avio_skip(pb, 4); /* start time */
620
621 dv_dur = avio_rl32(pb);
622 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
623 dv_dur *= AV_TIME_BASE;
624 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
625 }
626 /* else, leave duration alone; timing estimation in utils.c
627 * will make a guess based on bitrate. */
628
629 stream_index = s->nb_streams - 1;
630 avio_skip(pb, size - 9 * 4);
631 break;
632 }
633
634 av_assert0(stream_index < s->nb_streams);
635 ast->handler = handler;
636
637 avio_rl32(pb); /* flags */
638 avio_rl16(pb); /* priority */
639 avio_rl16(pb); /* language */
640 avio_rl32(pb); /* initial frame */
641 ast->scale = avio_rl32(pb);
642 ast->rate = avio_rl32(pb);
643 if (!(ast->scale && ast->rate)) {
644 av_log(s, AV_LOG_WARNING,
645 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
646 "(This file has been generated by broken software.)\n",
647 ast->scale,
648 ast->rate);
649 if (frame_period) {
650 ast->rate = 1000000;
651 ast->scale = frame_period;
652 } else {
653 ast->rate = 25;
654 ast->scale = 1;
655 }
656 }
657 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
658
659 ast->cum_len = avio_rl32(pb); /* start */
660 st->nb_frames = avio_rl32(pb);
661
662 st->start_time = 0;
663 avio_rl32(pb); /* buffer size */
664 avio_rl32(pb); /* quality */
665 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
666 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
667 ast->cum_len = 0;
668 }
669 ast->sample_size = avio_rl32(pb);
670 ast->cum_len *= FFMAX(1, ast->sample_size);
671 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
672 ast->rate, ast->scale, ast->sample_size);
673
674 switch (tag1) {
675 case MKTAG('v', 'i', 'd', 's'):
676 codec_type = AVMEDIA_TYPE_VIDEO;
677
678 ast->sample_size = 0;
679 st->avg_frame_rate = av_inv_q(st->time_base);
680 break;
681 case MKTAG('a', 'u', 'd', 's'):
682 codec_type = AVMEDIA_TYPE_AUDIO;
683 break;
684 case MKTAG('t', 'x', 't', 's'):
685 codec_type = AVMEDIA_TYPE_SUBTITLE;
686 break;
687 case MKTAG('d', 'a', 't', 's'):
688 codec_type = AVMEDIA_TYPE_DATA;
689 break;
690 default:
691 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
692 }
693
694 if (ast->sample_size < 0) {
695 if (s->error_recognition & AV_EF_EXPLODE) {
696 av_log(s, AV_LOG_ERROR,
697 "Invalid sample_size %d at stream %d\n",
698 ast->sample_size,
699 stream_index);
700 goto fail;
701 }
702 av_log(s, AV_LOG_WARNING,
703 "Invalid sample_size %d at stream %d "
704 "setting it to 0\n",
705 ast->sample_size,
706 stream_index);
707 ast->sample_size = 0;
708 }
709
710 if (ast->sample_size == 0) {
711 st->duration = st->nb_frames;
712 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
713 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
714 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
715 }
716 }
717 ast->frame_offset = ast->cum_len;
718 avio_skip(pb, size - 12 * 4);
719 break;
720 case MKTAG('s', 't', 'r', 'f'):
721 /* stream header */
722 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
723 codec_type == AVMEDIA_TYPE_VIDEO))
724 break;
725 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
726 avio_skip(pb, size);
727 } else {
728 uint64_t cur_pos = avio_tell(pb);
729 unsigned esize;
730 if (cur_pos < list_end)
731 size = FFMIN(size, list_end - cur_pos);
732 st = s->streams[stream_index];
733 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
734 avio_skip(pb, size);
735 break;
736 }
737 switch (codec_type) {
738 case AVMEDIA_TYPE_VIDEO:
739 if (amv_file_format) {
740 st->codecpar->width = avih_width;
741 st->codecpar->height = avih_height;
742 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
743 st->codecpar->codec_id = AV_CODEC_ID_AMV;
744 avio_skip(pb, size);
745 break;
746 }
747 tag1 = ff_get_bmp_header(pb, st, &esize);
748
749 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
750 tag1 == MKTAG('D', 'X', 'S', 'A')) {
751 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
752 st->codecpar->codec_tag = tag1;
753 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
754 break;
755 }
756
757 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
758 if (esize == size-1 && (esize&1)) {
759 st->codecpar->extradata_size = esize - 10 * 4;
760 } else
761 st->codecpar->extradata_size = size - 10 * 4;
762 if (st->codecpar->extradata) {
763 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
764 }
765 ret = ff_get_extradata(s, st->codecpar, pb,
766 st->codecpar->extradata_size);
767 if (ret < 0)
768 return ret;
769 }
770
771 // FIXME: check if the encoder really did this correctly
772 if (st->codecpar->extradata_size & 1)
773 avio_r8(pb);
774
775 /* Extract palette from extradata if bpp <= 8.
776 * This code assumes that extradata contains only palette.
777 * This is true for all paletted codecs implemented in
778 * FFmpeg. */
779 if (st->codecpar->extradata_size &&
780 (st->codecpar->bits_per_coded_sample <= 8)) {
781 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
782 const uint8_t *pal_src;
783
784 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
785 pal_src = st->codecpar->extradata +
786 st->codecpar->extradata_size - pal_size;
787 /* Exclude the "BottomUp" field from the palette */
788 if (pal_src - st->codecpar->extradata >= 9 &&
789 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
790 pal_src -= 9;
791 for (i = 0; i < pal_size / 4; i++)
792 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
793 ast->has_pal = 1;
794 }
795
796 print_tag(s, "video", tag1, 0);
797
798 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
799 st->codecpar->codec_tag = tag1;
800 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
801 tag1);
802 /* If codec is not found yet, try with the mov tags. */
803 if (!st->codecpar->codec_id) {
804 st->codecpar->codec_id =
805 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
806 if (st->codecpar->codec_id)
807 av_log(s, AV_LOG_WARNING,
808 "mov tag found in avi (fourcc %s)\n",
809 av_fourcc2str(tag1));
810 }
811 if (!st->codecpar->codec_id)
812 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
813
814 /* This is needed to get the pict type which is necessary
815 * for generating correct pts. */
816 st->need_parsing = AVSTREAM_PARSE_HEADERS;
817
818 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
819 ast->handler == MKTAG('X', 'V', 'I', 'D'))
820 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
821
822 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
823 st->need_parsing = AVSTREAM_PARSE_FULL;
824 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
825 st->need_parsing = AVSTREAM_PARSE_NONE;
826 if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
827 st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
828 st->need_parsing = AVSTREAM_PARSE_FULL;
829
830 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
831 st->codecpar->extradata_size < 1U << 30) {
832 st->codecpar->extradata_size += 9;
833 if ((ret = av_reallocp(&st->codecpar->extradata,
834 st->codecpar->extradata_size +
835 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
836 st->codecpar->extradata_size = 0;
837 return ret;
838 } else
839 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
840 "BottomUp", 9);
841 }
842 st->codecpar->height = FFABS(st->codecpar->height);
843
844 // avio_skip(pb, size - 5 * 4);
845 break;
846 case AVMEDIA_TYPE_AUDIO:
847 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
848 if (ret < 0)
849 return ret;
850 ast->dshow_block_align = st->codecpar->block_align;
851 if (ast->sample_size && st->codecpar->block_align &&
852 ast->sample_size != st->codecpar->block_align) {
853 av_log(s,
854 AV_LOG_WARNING,
855 "sample size (%d) != block align (%d)\n",
856 ast->sample_size,
857 st->codecpar->block_align);
858 ast->sample_size = st->codecpar->block_align;
859 }
860 /* 2-aligned
861 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
862 if (size & 1)
863 avio_skip(pb, 1);
864 /* Force parsing as several audio frames can be in
865 * one packet and timestamps refer to packet start. */
866 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
867 /* ADTS header is in extradata, AAC without header must be
868 * stored as exact frames. Parser not needed and it will
869 * fail. */
870 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
871 st->codecpar->extradata_size)
872 st->need_parsing = AVSTREAM_PARSE_NONE;
873 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
874 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
875 st->need_parsing = AVSTREAM_PARSE_NONE;
876 /* AVI files with Xan DPCM audio (wrongly) declare PCM
877 * audio in the header but have Axan as stream_code_tag. */
878 if (ast->handler == AV_RL32("Axan")) {
879 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
880 st->codecpar->codec_tag = 0;
881 ast->dshow_block_align = 0;
882 }
883 if (amv_file_format) {
884 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
885 ast->dshow_block_align = 0;
886 }
887 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
888 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
889 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
890 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
891 ast->dshow_block_align = 0;
892 }
893 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
894 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
895 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
896 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
897 ast->sample_size = 0;
898 }
899 break;
900 case AVMEDIA_TYPE_SUBTITLE:
901 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
902 st->request_probe= 1;
903 avio_skip(pb, size);
904 break;
905 default:
906 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
907 st->codecpar->codec_id = AV_CODEC_ID_NONE;
908 st->codecpar->codec_tag = 0;
909 avio_skip(pb, size);
910 break;
911 }
912 }
913 break;
914 case MKTAG('s', 't', 'r', 'd'):
915 if (stream_index >= (unsigned)s->nb_streams
916 || s->streams[stream_index]->codecpar->extradata_size
917 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
918 avio_skip(pb, size);
919 } else {
920 uint64_t cur_pos = avio_tell(pb);
921 if (cur_pos < list_end)
922 size = FFMIN(size, list_end - cur_pos);
923 st = s->streams[stream_index];
924
925 if (size<(1<<30)) {
926 if (st->codecpar->extradata) {
927 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
928 }
929 if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
930 return ret;
931 }
932
933 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
934 avio_r8(pb);
935
936 ret = avi_extract_stream_metadata(s, st);
937 if (ret < 0) {
938 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
939 }
940 }
941 break;
942 case MKTAG('i', 'n', 'd', 'x'):
943 pos = avio_tell(pb);
944 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
945 avi->use_odml &&
946 read_odml_index(s, 0) < 0 &&
947 (s->error_recognition & AV_EF_EXPLODE))
948 goto fail;
949 avio_seek(pb, pos + size, SEEK_SET);
950 break;
951 case MKTAG('v', 'p', 'r', 'p'):
952 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
953 AVRational active, active_aspect;
954
955 st = s->streams[stream_index];
956 avio_rl32(pb);
957 avio_rl32(pb);
958 avio_rl32(pb);
959 avio_rl32(pb);
960 avio_rl32(pb);
961
962 active_aspect.den = avio_rl16(pb);
963 active_aspect.num = avio_rl16(pb);
964 active.num = avio_rl32(pb);
965 active.den = avio_rl32(pb);
966 avio_rl32(pb); // nbFieldsPerFrame
967
968 if (active_aspect.num && active_aspect.den &&
969 active.num && active.den) {
970 st->sample_aspect_ratio = av_div_q(active_aspect, active);
971 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
972 active_aspect.num, active_aspect.den,
973 active.num, active.den);
974 }
975 size -= 9 * 4;
976 }
977 avio_skip(pb, size);
978 break;
979 case MKTAG('s', 't', 'r', 'n'):
980 if (s->nb_streams) {
981 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
982 if (ret < 0)
983 return ret;
984 break;
985 }
986 default:
987 if (size > 1000000) {
988 av_log(s, AV_LOG_ERROR,
989 "Something went wrong during header parsing, "
990 "tag %s has size %u, "
991 "I will ignore it and try to continue anyway.\n",
992 av_fourcc2str(tag), size);
993 if (s->error_recognition & AV_EF_EXPLODE)
994 goto fail;
995 avi->movi_list = avio_tell(pb) - 4;
996 avi->movi_end = avi->fsize;
997 goto end_of_header;
998 }
999 /* Do not fail for very large idx1 tags */
1000 case MKTAG('i', 'd', 'x', '1'):
1001 /* skip tag */
1002 size += (size & 1);
1003 avio_skip(pb, size);
1004 break;
1005 }
1006 }
1007
1008 end_of_header:
1009 /* check stream number */
1010 if (stream_index != s->nb_streams - 1) {
1011
1012 fail:
1013 return AVERROR_INVALIDDATA;
1014 }
1015
1016 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1017 avi_load_index(s);
1018 calculate_bitrate(s);
1019 avi->index_loaded |= 1;
1020
1021 if ((ret = guess_ni_flag(s)) < 0)
1022 return ret;
1023
1024 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1025
1026 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1027 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1028 for (i = 0; i < s->nb_streams; i++) {
1029 AVStream *st = s->streams[i];
1030 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1031 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1032 st->need_parsing = AVSTREAM_PARSE_FULL;
1033 }
1034
1035 for (i = 0; i < s->nb_streams; i++) {
1036 AVStream *st = s->streams[i];
1037 if (st->nb_index_entries)
1038 break;
1039 }
1040 // DV-in-AVI cannot be non-interleaved, if set this must be
1041 // a mis-detection.
1042 if (avi->dv_demux)
1043 avi->non_interleaved = 0;
1044 if (i == s->nb_streams && avi->non_interleaved) {
1045 av_log(s, AV_LOG_WARNING,
1046 "Non-interleaved AVI without index, switching to interleaved\n");
1047 avi->non_interleaved = 0;
1048 }
1049
1050 if (avi->non_interleaved) {
1051 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1052 clean_index(s);
1053 }
1054
1055 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1056 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1057
1058 return 0;
1059 }
1060
read_gab2_sub(AVFormatContext * s,AVStream * st,AVPacket * pkt)1061 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1062 {
1063 if (pkt->size >= 7 &&
1064 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1065 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1066 uint8_t desc[256];
1067 int score = AVPROBE_SCORE_EXTENSION, ret;
1068 AVIStream *ast = st->priv_data;
1069 ff_const59 AVInputFormat *sub_demuxer;
1070 AVRational time_base;
1071 int size;
1072 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1073 pkt->size - 7,
1074 0, NULL, NULL, NULL, NULL);
1075 AVProbeData pd;
1076 unsigned int desc_len = avio_rl32(pb);
1077
1078 if (desc_len > pb->buf_end - pb->buf_ptr)
1079 goto error;
1080
1081 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1082 avio_skip(pb, desc_len - ret);
1083 if (*desc)
1084 av_dict_set(&st->metadata, "title", desc, 0);
1085
1086 avio_rl16(pb); /* flags? */
1087 avio_rl32(pb); /* data size */
1088
1089 size = pb->buf_end - pb->buf_ptr;
1090 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1091 .buf_size = size };
1092 if (!pd.buf)
1093 goto error;
1094 memcpy(pd.buf, pb->buf_ptr, size);
1095 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1096 av_freep(&pd.buf);
1097 if (!sub_demuxer)
1098 goto error;
1099
1100 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1101 goto error;
1102
1103 if (!(ast->sub_ctx = avformat_alloc_context()))
1104 goto error;
1105
1106 ast->sub_ctx->pb = pb;
1107
1108 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1109 goto error;
1110
1111 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1112 if (ast->sub_ctx->nb_streams != 1)
1113 goto error;
1114 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1115 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1116 time_base = ast->sub_ctx->streams[0]->time_base;
1117 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1118 }
1119 ast->sub_buffer = pkt->buf;
1120 pkt->buf = NULL;
1121 av_packet_unref(pkt);
1122 return 1;
1123
1124 error:
1125 av_freep(&ast->sub_ctx);
1126 avio_context_free(&pb);
1127 }
1128 return 0;
1129 }
1130
get_subtitle_pkt(AVFormatContext * s,AVStream * next_st,AVPacket * pkt)1131 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1132 AVPacket *pkt)
1133 {
1134 AVIStream *ast, *next_ast = next_st->priv_data;
1135 int64_t ts, next_ts, ts_min = INT64_MAX;
1136 AVStream *st, *sub_st = NULL;
1137 int i;
1138
1139 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1140 AV_TIME_BASE_Q);
1141
1142 for (i = 0; i < s->nb_streams; i++) {
1143 st = s->streams[i];
1144 ast = st->priv_data;
1145 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1146 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1147 if (ts <= next_ts && ts < ts_min) {
1148 ts_min = ts;
1149 sub_st = st;
1150 }
1151 }
1152 }
1153
1154 if (sub_st) {
1155 ast = sub_st->priv_data;
1156 *pkt = ast->sub_pkt;
1157 pkt->stream_index = sub_st->index;
1158
1159 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1160 ast->sub_pkt.data = NULL;
1161 }
1162 return sub_st;
1163 }
1164
get_stream_idx(const unsigned * d)1165 static int get_stream_idx(const unsigned *d)
1166 {
1167 if (d[0] >= '0' && d[0] <= '9' &&
1168 d[1] >= '0' && d[1] <= '9') {
1169 return (d[0] - '0') * 10 + (d[1] - '0');
1170 } else {
1171 return 100; // invalid stream ID
1172 }
1173 }
1174
1175 /**
1176 *
1177 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1178 */
avi_sync(AVFormatContext * s,int exit_early)1179 static int avi_sync(AVFormatContext *s, int exit_early)
1180 {
1181 AVIContext *avi = s->priv_data;
1182 AVIOContext *pb = s->pb;
1183 int n;
1184 unsigned int d[8];
1185 unsigned int size;
1186 int64_t i, sync;
1187
1188 start_sync:
1189 memset(d, -1, sizeof(d));
1190 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1191 int j;
1192
1193 for (j = 0; j < 7; j++)
1194 d[j] = d[j + 1];
1195 d[7] = avio_r8(pb);
1196
1197 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1198
1199 n = get_stream_idx(d + 2);
1200 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1201 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1202 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1203 continue;
1204
1205 // parse ix##
1206 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1207 // parse JUNK
1208 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1209 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1210 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1211 avio_skip(pb, size);
1212 goto start_sync;
1213 }
1214
1215 // parse stray LIST
1216 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1217 avio_skip(pb, 4);
1218 goto start_sync;
1219 }
1220
1221 n = get_stream_idx(d);
1222
1223 if (!((i - avi->last_pkt_pos) & 1) &&
1224 get_stream_idx(d + 1) < s->nb_streams)
1225 continue;
1226
1227 // detect ##ix chunk and skip
1228 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1229 avio_skip(pb, size);
1230 goto start_sync;
1231 }
1232
1233 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1234 avio_skip(pb, 16 * 3 + 8);
1235 goto start_sync;
1236 }
1237
1238 if (avi->dv_demux && n != 0)
1239 continue;
1240
1241 // parse ##dc/##wb
1242 if (n < s->nb_streams) {
1243 AVStream *st;
1244 AVIStream *ast;
1245 st = s->streams[n];
1246 ast = st->priv_data;
1247
1248 if (!ast) {
1249 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1250 continue;
1251 }
1252
1253 if (s->nb_streams >= 2) {
1254 AVStream *st1 = s->streams[1];
1255 AVIStream *ast1 = st1->priv_data;
1256 // workaround for broken small-file-bug402.avi
1257 if ( d[2] == 'w' && d[3] == 'b'
1258 && n == 0
1259 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1260 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1261 && ast->prefix == 'd'*256+'c'
1262 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1263 ) {
1264 n = 1;
1265 st = st1;
1266 ast = ast1;
1267 av_log(s, AV_LOG_WARNING,
1268 "Invalid stream + prefix combination, assuming audio.\n");
1269 }
1270 }
1271
1272 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1273 int k = avio_r8(pb);
1274 int last = (k + avio_r8(pb) - 1) & 0xFF;
1275
1276 avio_rl16(pb); // flags
1277
1278 // b + (g << 8) + (r << 16);
1279 for (; k <= last; k++)
1280 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1281
1282 ast->has_pal = 1;
1283 goto start_sync;
1284 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1285 d[2] < 128 && d[3] < 128) ||
1286 d[2] * 256 + d[3] == ast->prefix /* ||
1287 (d[2] == 'd' && d[3] == 'c') ||
1288 (d[2] == 'w' && d[3] == 'b') */) {
1289 if (exit_early)
1290 return 0;
1291 if (d[2] * 256 + d[3] == ast->prefix)
1292 ast->prefix_count++;
1293 else {
1294 ast->prefix = d[2] * 256 + d[3];
1295 ast->prefix_count = 0;
1296 }
1297
1298 if (!avi->dv_demux &&
1299 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1300 // FIXME: needs a little reordering
1301 (st->discard >= AVDISCARD_NONKEY &&
1302 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1303 || st->discard >= AVDISCARD_ALL)) {
1304
1305 ast->frame_offset += get_duration(ast, size);
1306 avio_skip(pb, size);
1307 goto start_sync;
1308 }
1309
1310 avi->stream_index = n;
1311 ast->packet_size = size + 8;
1312 ast->remaining = size;
1313
1314 if (size) {
1315 uint64_t pos = avio_tell(pb) - 8;
1316 if (!st->index_entries || !st->nb_index_entries ||
1317 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1318 av_add_index_entry(st, pos, ast->frame_offset, size,
1319 0, AVINDEX_KEYFRAME);
1320 }
1321 }
1322 return 0;
1323 }
1324 }
1325 }
1326
1327 if (pb->error)
1328 return pb->error;
1329 return AVERROR_EOF;
1330 }
1331
ni_prepare_read(AVFormatContext * s)1332 static int ni_prepare_read(AVFormatContext *s)
1333 {
1334 AVIContext *avi = s->priv_data;
1335 int best_stream_index = 0;
1336 AVStream *best_st = NULL;
1337 AVIStream *best_ast;
1338 int64_t best_ts = INT64_MAX;
1339 int i;
1340
1341 for (i = 0; i < s->nb_streams; i++) {
1342 AVStream *st = s->streams[i];
1343 AVIStream *ast = st->priv_data;
1344 int64_t ts = ast->frame_offset;
1345 int64_t last_ts;
1346
1347 if (!st->nb_index_entries)
1348 continue;
1349
1350 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1351 if (!ast->remaining && ts > last_ts)
1352 continue;
1353
1354 ts = av_rescale_q(ts, st->time_base,
1355 (AVRational) { FFMAX(1, ast->sample_size),
1356 AV_TIME_BASE });
1357
1358 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1359 st->time_base.num, st->time_base.den, ast->frame_offset);
1360 if (ts < best_ts) {
1361 best_ts = ts;
1362 best_st = st;
1363 best_stream_index = i;
1364 }
1365 }
1366 if (!best_st)
1367 return AVERROR_EOF;
1368
1369 best_ast = best_st->priv_data;
1370 best_ts = best_ast->frame_offset;
1371 if (best_ast->remaining) {
1372 i = av_index_search_timestamp(best_st,
1373 best_ts,
1374 AVSEEK_FLAG_ANY |
1375 AVSEEK_FLAG_BACKWARD);
1376 } else {
1377 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1378 if (i >= 0)
1379 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1380 }
1381
1382 if (i >= 0) {
1383 int64_t pos = best_st->index_entries[i].pos;
1384 pos += best_ast->packet_size - best_ast->remaining;
1385 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1386 return AVERROR_EOF;
1387
1388 av_assert0(best_ast->remaining <= best_ast->packet_size);
1389
1390 avi->stream_index = best_stream_index;
1391 if (!best_ast->remaining)
1392 best_ast->packet_size =
1393 best_ast->remaining = best_st->index_entries[i].size;
1394 }
1395 else
1396 return AVERROR_EOF;
1397
1398 return 0;
1399 }
1400
avi_read_packet(AVFormatContext * s,AVPacket * pkt)1401 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1402 {
1403 AVIContext *avi = s->priv_data;
1404 AVIOContext *pb = s->pb;
1405 int err;
1406
1407 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1408 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1409 if (size >= 0)
1410 return size;
1411 else
1412 goto resync;
1413 }
1414
1415 if (avi->non_interleaved) {
1416 err = ni_prepare_read(s);
1417 if (err < 0)
1418 return err;
1419 }
1420
1421 resync:
1422 if (avi->stream_index >= 0) {
1423 AVStream *st = s->streams[avi->stream_index];
1424 AVIStream *ast = st->priv_data;
1425 int dv_demux = CONFIG_DV_DEMUXER && avi->dv_demux;
1426 int size, err;
1427
1428 if (get_subtitle_pkt(s, st, pkt))
1429 return 0;
1430
1431 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1432 if (ast->sample_size <= 1)
1433 size = INT_MAX;
1434 else if (ast->sample_size < 32)
1435 // arbitrary multiplier to avoid tiny packets for raw PCM data
1436 size = 1024 * ast->sample_size;
1437 else
1438 size = ast->sample_size;
1439
1440 if (size > ast->remaining)
1441 size = ast->remaining;
1442 avi->last_pkt_pos = avio_tell(pb);
1443 err = av_get_packet(pb, pkt, size);
1444 if (err < 0)
1445 return err;
1446 size = err;
1447
1448 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2 && !dv_demux) {
1449 uint8_t *pal;
1450 pal = av_packet_new_side_data(pkt,
1451 AV_PKT_DATA_PALETTE,
1452 AVPALETTE_SIZE);
1453 if (!pal) {
1454 av_log(s, AV_LOG_ERROR,
1455 "Failed to allocate data for palette\n");
1456 } else {
1457 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1458 ast->has_pal = 0;
1459 }
1460 }
1461
1462 if (dv_demux) {
1463 AVBufferRef *avbuf = pkt->buf;
1464 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1465 pkt->data, pkt->size, pkt->pos);
1466 pkt->buf = avbuf;
1467 pkt->flags |= AV_PKT_FLAG_KEY;
1468 if (size < 0)
1469 av_packet_unref(pkt);
1470 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1471 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1472 ast->frame_offset++;
1473 avi->stream_index = -1;
1474 ast->remaining = 0;
1475 goto resync;
1476 } else {
1477 /* XXX: How to handle B-frames in AVI? */
1478 pkt->dts = ast->frame_offset;
1479 // pkt->dts += ast->start;
1480 if (ast->sample_size)
1481 pkt->dts /= ast->sample_size;
1482 pkt->stream_index = avi->stream_index;
1483
1484 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1485 AVIndexEntry *e;
1486 int index;
1487
1488 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1489 e = &st->index_entries[index];
1490
1491 if (index >= 0 && e->timestamp == ast->frame_offset) {
1492 if (index == st->nb_index_entries-1) {
1493 int key=1;
1494 uint32_t state=-1;
1495 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1496 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1497 while (ptr < end) {
1498 ptr = avpriv_find_start_code(ptr, end, &state);
1499 if (state == 0x1B6 && ptr < end) {
1500 key = !(*ptr & 0xC0);
1501 break;
1502 }
1503 }
1504 }
1505 if (!key)
1506 e->flags &= ~AVINDEX_KEYFRAME;
1507 }
1508 if (e->flags & AVINDEX_KEYFRAME)
1509 pkt->flags |= AV_PKT_FLAG_KEY;
1510 }
1511 } else {
1512 pkt->flags |= AV_PKT_FLAG_KEY;
1513 }
1514 ast->frame_offset += get_duration(ast, pkt->size);
1515 }
1516 ast->remaining -= err;
1517 if (!ast->remaining) {
1518 avi->stream_index = -1;
1519 ast->packet_size = 0;
1520 }
1521
1522 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1523 av_packet_unref(pkt);
1524 goto resync;
1525 }
1526 ast->seek_pos= 0;
1527
1528 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1529 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1530
1531 if (avi->dts_max < dts) {
1532 avi->dts_max = dts;
1533 } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1534 avi->non_interleaved= 1;
1535 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1536 }
1537 }
1538
1539 return 0;
1540 }
1541
1542 if ((err = avi_sync(s, 0)) < 0)
1543 return err;
1544 goto resync;
1545 }
1546
1547 /* XXX: We make the implicit supposition that the positions are sorted
1548 * for each stream. */
avi_read_idx1(AVFormatContext * s,int size)1549 static int avi_read_idx1(AVFormatContext *s, int size)
1550 {
1551 AVIContext *avi = s->priv_data;
1552 AVIOContext *pb = s->pb;
1553 int nb_index_entries, i;
1554 AVStream *st;
1555 AVIStream *ast;
1556 int64_t pos;
1557 unsigned int index, tag, flags, len, first_packet = 1;
1558 int64_t last_pos = -1;
1559 unsigned last_idx = -1;
1560 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1561 int anykey = 0;
1562
1563 nb_index_entries = size / 16;
1564 if (nb_index_entries <= 0)
1565 return AVERROR_INVALIDDATA;
1566
1567 idx1_pos = avio_tell(pb);
1568 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1569 if (avi_sync(s, 1) == 0)
1570 first_packet_pos = avio_tell(pb) - 8;
1571 avi->stream_index = -1;
1572 avio_seek(pb, idx1_pos, SEEK_SET);
1573
1574 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1575 first_packet_pos = 0;
1576 data_offset = avi->movi_list;
1577 }
1578
1579 /* Read the entries and sort them in each stream component. */
1580 for (i = 0; i < nb_index_entries; i++) {
1581 if (avio_feof(pb))
1582 return -1;
1583
1584 tag = avio_rl32(pb);
1585 flags = avio_rl32(pb);
1586 pos = avio_rl32(pb);
1587 len = avio_rl32(pb);
1588 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1589 i, tag, flags, pos, len);
1590
1591 index = ((tag & 0xff) - '0') * 10;
1592 index += (tag >> 8 & 0xff) - '0';
1593 if (index >= s->nb_streams)
1594 continue;
1595 st = s->streams[index];
1596 ast = st->priv_data;
1597
1598 /* Skip 'xxpc' palette change entries in the index until a logic
1599 * to process these is properly implemented. */
1600 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1601 continue;
1602
1603 if (first_packet && first_packet_pos) {
1604 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1605 data_offset = first_packet_pos - pos;
1606 first_packet = 0;
1607 }
1608 pos += data_offset;
1609
1610 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1611
1612 // even if we have only a single stream, we should
1613 // switch to non-interleaved to get correct timestamps
1614 if (last_pos == pos)
1615 avi->non_interleaved = 1;
1616 if (last_idx != pos && len) {
1617 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1618 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1619 last_idx= pos;
1620 }
1621 ast->cum_len += get_duration(ast, len);
1622 last_pos = pos;
1623 anykey |= flags&AVIIF_INDEX;
1624 }
1625 if (!anykey) {
1626 for (index = 0; index < s->nb_streams; index++) {
1627 st = s->streams[index];
1628 if (st->nb_index_entries)
1629 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1630 }
1631 }
1632 return 0;
1633 }
1634
1635 /* Scan the index and consider any file with streams more than
1636 * 2 seconds or 64MB apart non-interleaved. */
check_stream_max_drift(AVFormatContext * s)1637 static int check_stream_max_drift(AVFormatContext *s)
1638 {
1639 int64_t min_pos, pos;
1640 int i;
1641 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1642 if (!idx)
1643 return AVERROR(ENOMEM);
1644 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1645 int64_t max_dts = INT64_MIN / 2;
1646 int64_t min_dts = INT64_MAX / 2;
1647 int64_t max_buffer = 0;
1648
1649 min_pos = INT64_MAX;
1650
1651 for (i = 0; i < s->nb_streams; i++) {
1652 AVStream *st = s->streams[i];
1653 AVIStream *ast = st->priv_data;
1654 int n = st->nb_index_entries;
1655 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1656 idx[i]++;
1657 if (idx[i] < n) {
1658 int64_t dts;
1659 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1660 FFMAX(ast->sample_size, 1),
1661 st->time_base, AV_TIME_BASE_Q);
1662 min_dts = FFMIN(min_dts, dts);
1663 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1664 }
1665 }
1666 for (i = 0; i < s->nb_streams; i++) {
1667 AVStream *st = s->streams[i];
1668 AVIStream *ast = st->priv_data;
1669
1670 if (idx[i] && min_dts != INT64_MAX / 2) {
1671 int64_t dts;
1672 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1673 FFMAX(ast->sample_size, 1),
1674 st->time_base, AV_TIME_BASE_Q);
1675 max_dts = FFMAX(max_dts, dts);
1676 max_buffer = FFMAX(max_buffer,
1677 av_rescale(dts - min_dts,
1678 st->codecpar->bit_rate,
1679 AV_TIME_BASE));
1680 }
1681 }
1682 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1683 max_buffer > 1024 * 1024 * 8 * 8) {
1684 av_free(idx);
1685 return 1;
1686 }
1687 }
1688 av_free(idx);
1689 return 0;
1690 }
1691
guess_ni_flag(AVFormatContext * s)1692 static int guess_ni_flag(AVFormatContext *s)
1693 {
1694 int i;
1695 int64_t last_start = 0;
1696 int64_t first_end = INT64_MAX;
1697 int64_t oldpos = avio_tell(s->pb);
1698
1699 for (i = 0; i < s->nb_streams; i++) {
1700 AVStream *st = s->streams[i];
1701 int n = st->nb_index_entries;
1702 unsigned int size;
1703
1704 if (n <= 0)
1705 continue;
1706
1707 if (n >= 2) {
1708 int64_t pos = st->index_entries[0].pos;
1709 unsigned tag[2];
1710 avio_seek(s->pb, pos, SEEK_SET);
1711 tag[0] = avio_r8(s->pb);
1712 tag[1] = avio_r8(s->pb);
1713 avio_rl16(s->pb);
1714 size = avio_rl32(s->pb);
1715 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1716 last_start = INT64_MAX;
1717 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1718 last_start = INT64_MAX;
1719 }
1720
1721 if (st->index_entries[0].pos > last_start)
1722 last_start = st->index_entries[0].pos;
1723 if (st->index_entries[n - 1].pos < first_end)
1724 first_end = st->index_entries[n - 1].pos;
1725 }
1726 avio_seek(s->pb, oldpos, SEEK_SET);
1727
1728 if (last_start > first_end)
1729 return 1;
1730
1731 return check_stream_max_drift(s);
1732 }
1733
avi_load_index(AVFormatContext * s)1734 static int avi_load_index(AVFormatContext *s)
1735 {
1736 AVIContext *avi = s->priv_data;
1737 AVIOContext *pb = s->pb;
1738 uint32_t tag, size;
1739 int64_t pos = avio_tell(pb);
1740 int64_t next;
1741 int ret = -1;
1742
1743 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1744 goto the_end; // maybe truncated file
1745 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1746 for (;;) {
1747 tag = avio_rl32(pb);
1748 size = avio_rl32(pb);
1749 if (avio_feof(pb))
1750 break;
1751 next = avio_tell(pb) + size + (size & 1);
1752
1753 if (tag == MKTAG('i', 'd', 'x', '1') &&
1754 avi_read_idx1(s, size) >= 0) {
1755 avi->index_loaded=2;
1756 ret = 0;
1757 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1758 uint32_t tag1 = avio_rl32(pb);
1759
1760 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1761 ff_read_riff_info(s, size - 4);
1762 }else if (!ret)
1763 break;
1764
1765 if (avio_seek(pb, next, SEEK_SET) < 0)
1766 break; // something is wrong here
1767 }
1768
1769 the_end:
1770 avio_seek(pb, pos, SEEK_SET);
1771 return ret;
1772 }
1773
seek_subtitle(AVStream * st,AVStream * st2,int64_t timestamp)1774 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1775 {
1776 AVIStream *ast2 = st2->priv_data;
1777 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1778 av_packet_unref(&ast2->sub_pkt);
1779 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1780 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1781 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1782 }
1783
avi_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)1784 static int avi_read_seek(AVFormatContext *s, int stream_index,
1785 int64_t timestamp, int flags)
1786 {
1787 AVIContext *avi = s->priv_data;
1788 AVStream *st;
1789 int i, index;
1790 int64_t pos, pos_min;
1791 AVIStream *ast;
1792
1793 /* Does not matter which stream is requested dv in avi has the
1794 * stream information in the first video stream.
1795 */
1796 if (avi->dv_demux)
1797 stream_index = 0;
1798
1799 if (!avi->index_loaded) {
1800 /* we only load the index on demand */
1801 avi_load_index(s);
1802 avi->index_loaded |= 1;
1803 }
1804 av_assert0(stream_index >= 0);
1805
1806 st = s->streams[stream_index];
1807 ast = st->priv_data;
1808 index = av_index_search_timestamp(st,
1809 timestamp * FFMAX(ast->sample_size, 1),
1810 flags);
1811 if (index < 0) {
1812 if (st->nb_index_entries > 0)
1813 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1814 timestamp * FFMAX(ast->sample_size, 1),
1815 st->index_entries[0].timestamp,
1816 st->index_entries[st->nb_index_entries - 1].timestamp);
1817 return AVERROR_INVALIDDATA;
1818 }
1819
1820 /* find the position */
1821 pos = st->index_entries[index].pos;
1822 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1823
1824 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1825 timestamp, index, st->index_entries[index].timestamp);
1826
1827 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1828 /* One and only one real stream for DV in AVI, and it has video */
1829 /* offsets. Calling with other stream indexes should have failed */
1830 /* the av_index_search_timestamp call above. */
1831
1832 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1833 return -1;
1834
1835 /* Feed the DV video stream version of the timestamp to the */
1836 /* DV demux so it can synthesize correct timestamps. */
1837 ff_dv_offset_reset(avi->dv_demux, timestamp);
1838
1839 avi->stream_index = -1;
1840 return 0;
1841 }
1842
1843 pos_min = pos;
1844 for (i = 0; i < s->nb_streams; i++) {
1845 AVStream *st2 = s->streams[i];
1846 AVIStream *ast2 = st2->priv_data;
1847
1848 ast2->packet_size =
1849 ast2->remaining = 0;
1850
1851 if (ast2->sub_ctx) {
1852 seek_subtitle(st, st2, timestamp);
1853 continue;
1854 }
1855
1856 if (st2->nb_index_entries <= 0)
1857 continue;
1858
1859 // av_assert1(st2->codecpar->block_align);
1860 index = av_index_search_timestamp(st2,
1861 av_rescale_q(timestamp,
1862 st->time_base,
1863 st2->time_base) *
1864 FFMAX(ast2->sample_size, 1),
1865 flags |
1866 AVSEEK_FLAG_BACKWARD |
1867 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1868 if (index < 0)
1869 index = 0;
1870 ast2->seek_pos = st2->index_entries[index].pos;
1871 pos_min = FFMIN(pos_min,ast2->seek_pos);
1872 }
1873 for (i = 0; i < s->nb_streams; i++) {
1874 AVStream *st2 = s->streams[i];
1875 AVIStream *ast2 = st2->priv_data;
1876
1877 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1878 continue;
1879
1880 index = av_index_search_timestamp(
1881 st2,
1882 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1883 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1884 if (index < 0)
1885 index = 0;
1886 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1887 index--;
1888 ast2->frame_offset = st2->index_entries[index].timestamp;
1889 }
1890
1891 /* do the seek */
1892 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1893 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1894 return -1;
1895 }
1896 avi->stream_index = -1;
1897 avi->dts_max = INT_MIN;
1898 return 0;
1899 }
1900
avi_read_close(AVFormatContext * s)1901 static int avi_read_close(AVFormatContext *s)
1902 {
1903 int i;
1904 AVIContext *avi = s->priv_data;
1905
1906 for (i = 0; i < s->nb_streams; i++) {
1907 AVStream *st = s->streams[i];
1908 AVIStream *ast = st->priv_data;
1909 if (ast) {
1910 if (ast->sub_ctx) {
1911 av_freep(&ast->sub_ctx->pb);
1912 avformat_close_input(&ast->sub_ctx);
1913 }
1914 av_buffer_unref(&ast->sub_buffer);
1915 av_packet_unref(&ast->sub_pkt);
1916 }
1917 }
1918
1919 av_freep(&avi->dv_demux);
1920
1921 return 0;
1922 }
1923
avi_probe(const AVProbeData * p)1924 static int avi_probe(const AVProbeData *p)
1925 {
1926 int i;
1927
1928 /* check file header */
1929 for (i = 0; avi_headers[i][0]; i++)
1930 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1931 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1932 return AVPROBE_SCORE_MAX;
1933
1934 return 0;
1935 }
1936
1937 AVInputFormat ff_avi_demuxer = {
1938 .name = "avi",
1939 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1940 .priv_data_size = sizeof(AVIContext),
1941 .extensions = "avi",
1942 .read_probe = avi_probe,
1943 .read_header = avi_read_header,
1944 .read_packet = avi_read_packet,
1945 .read_close = avi_read_close,
1946 .read_seek = avi_read_seek,
1947 .priv_class = &demuxer_class,
1948 };
1949